MD_DataIdentification

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1

PR/VI East-West Deflections (DEFLEC96)

This 2' surface deflection of the vertical grid for Puerto Rico and the Virgin Islands
is distributed as the DEFLEC96 model. The computation used about 26,000 terrestrial
and marine gravity data held in the National Geodetic Survey gravity data base in
July 1996. These data were augmented bygravity data contributions from NGA (former
National Imagery and Mapping Agency) (formerDefense Mapping Agency).The deflections
wereobtained by numerical differentiation of cubicspline models along the parallels
of the GEOID96grid. The gravity values are based on theInternational Gravity Standardization
Net 1971IGSN71). The deflections are referred to in theGeodetic Reference System 1980
(GRS80)ellipsoidal normals. The curvature of the plumbline correction has been applied.
We areparticularly grateful to NGA (former National Imagery and Mapping Agency) for
theirassistance and their data contributions.

While every effort has been made to ensure that these data are accurate and reliable
within the limits of the current state of the art, NOAA cannot assume liability for
any damages caused by any errors or omissions in the data, nor as a result of the
failure of the data to function on a particular system. NOAA makes no warranty, expressed
or implied, nor does the fact of distribution constitute such a warranty.